Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type
CVE-2026-57436 is fixed in ruby-nokogiri on 1 platform by DEBIAN-CVE-2026-57436 (version 1.19.4+dfsg-1), released July 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ruby-nokogiri · Debian 14 | 1.19.4+dfsg-1 | DEBIAN-CVE-2026-57436 | Jul 3, 2026 |
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